Abstract: A mobile robot with hopping ability is constructed.In the flat environment,the robot moves with its wheels.In the environment with obstacles and ditches,the robot can hop to extend its motion range.The architecture of the robot mechanical system,the structure of the robot body,the hopping stance and the locomotion process are introduced.The hopping mechanical system,the hopping parameter adjusting system,and the overturning system are analyzed in detail,and the system design is presented.Some key parameters of the robot are determined according to requirements of the overall design.